Jar closure



June 21, 1932. L. R. N. CARVALHO JAR CLOSURE Filed Dec. 23, 1929 awe/"too (4%; W. If. M

dbkomg forced downwardly Patented June 21, 1932 UNITED STATES PATENT OFFICE LESLIE B. N. CARVALHO,

PANY,

OF TOLEDO, OHIO, ASSIGNOR TO THE CLOSURE SERVICE COM- OF TOLEDO, OHIO, A CORPORATION OF OHIO JAR GLO SURE Application filed December 23, 1929. Serial No. 415,958.

The present invention relates to improvements in closures for jars and the like containers and particularly to that type of closure which is held in sealing position by means of co-operating screw threads on the closure and jar.

In the average screw type closure embodying the principle of corner sealing taught in my Patent 1,713,918 dated May 21, 1929, the construction is such that the sealing ring or gasket is much larger in cross-section than is really necessary and by no means makes proper use of the entire available sealing surface. This condition exists because the attaching flange which forms the outer side sealing surface is of such great diameter at the point of juncture with the top portion that a comparatively wide sealing ring is required to span the space between said outer side sealing surface and the side sealing surface of the jar. Also the outer half of the sealing ring is unsupported on its lower side, with the result that when pressure is applied in placing a closure on a jar, the ring is and outwardly a sufficient distance to break contact between the inner side sealing surfaces. The objections to these conditions are obvious.

An object of the present invention is to provide a screw type closure in which the top portion or button is of such formation that the cross-sectional area of the sealing ring or gasket may be appreciably decreased, resulting in a saving of approximately 50 percent in material.

Another object is to provide a closure construction whereby the above stated saving in material is effected without detrimentally affecting the reliability of the seal.

Another object is to provide means, which, in addition to effecting the economy above referred to, increases the rigidity of the closure whereby an exceptionally reliable seal is obtainable.

Other objects will be in part apparent and in part pointed out hereinafter.

1n the accompanying drawing:

Fig. l is a perspective view partly in section showing the improved closure.

Fig. 2 is a vertical sectional view. I

Referring to the accompanying drawing, the neck 5 of the jar 6 or like container has the outer corner of its upper end, or finish, cut away .to form an annular recess 8 designed to receive a gasket or sealing ring 9. This recess is of such form that it provides a pair of right angularly disposed bottom and inner side sealing surfaces 11 and 12 respectively. Screw threads 7 are formed on the outer surface of the neck 5 in a plane below the recess 8, said threads being located entirely radially beyond the bottom sealing surface 11.

The closure 10 includes a circular top portion 13 or button and an attaching flange 11 depending from the margin of such top POI". tion. The attaching flange 14 is of standard construction, and accordingly is of greater diameter than the screw threads 7 on the neck 5, the screw threads 15 on the closure being for the greater part formed within the confines of the attaching flange. Ordinarily the attaching flange lt joins the top portion 13 or button of the closure in the manner indicated in dotted lines at A in Fig. 2. Such 'a structure obviously spaces the side sealing surface 18 on the closure a comparatively great distance from the sealing surface 12 on the neck 5 and therefore necessitates the use of a sealing gasket or ring which is quite large in cross sectional area.

According to the present invention, this side sealing surface 18 on the closure 10 is placed quite close to the sealing surfaces 11 and 12 on the jar neck 5, by forming a step 17 about the margin of the top portion 13 of the closure. A step 16 spaced inwardly and upwardly from the step 17 on the button 13, provides a top sealing surface which co-operates with the sealing surfaces 11, 12 and 18 in providing a circular chamber substantially square in cross section. By locat- .ing the side sealing surface 18 on the closure,

, said sealing ring is highly compressed and formed with a corner snugly contacts with said sealing surfaces.

When a closure of ordinary construction as indicated: in dotted lines in Fig. 2, is applied to a jar, there is a strong tendency to pull the sealing ring into thespace just above the top screw threads on the jar and closure. This is in part due to the resiliency of the top sealing surface. Such movement on the part of the sealing ring obviously breaks contact between, the inner vertical sealing surface 12 and the ring and; reduces. its sealing efiiciency. In the present invention, these objections are avoid.- ed by decreasing the size of the sealing ring and-,- receiving chamber therefor so that the ring cannot become displaced, and; at the. same time stiffening the closure in proximity to these sealing surfaces so that it does not yield greatly during attachment of the, closure to a jar or like container.

Modifications may be resorted to within the. spirit and scope of the appended claims.

What I claim is:

l. A closure com rising a circular top portion, an attaching ange depending, from the. margin of the top portion, a pair of adjoin.- ing inner and outer steps formed about the margin of the top portion parallel with. and. in planes below the latter and providing out,- er vertical and top sealing surfaces, screw threads formed 011 said fiange and for the greater part disposed directly below the outer step, and a sealing gasket affixed. to the inner step and vertical sealing surface.

2. In combination, a jar comprisinga neck formed with an annular recess in the outer corner of its upper end providing bottom and inner vertical sealing surfaces, said neck having screw threads below the recess, a 010- sure for the jar comprising a ,circulartop portion, an attaching flange depending from the margin of the top portion, said flange being of greater diameter than the screw threads on the jar and having screw threads adapted to engage the threads onthe jar, a pain of adjoining inner and outer steps for-med about the margin of the top port-ionparallel with the latter and providing top and outer vertical sealing surfaces, the outer step being disposed directly above and in vertical alignmentwith the screw threads on thejar and closure, and asealing gasket adapted to seat in said annular recess.

3. A closure comprising a circular-top portion, an attaching flange depending from the margin 0f.'the topportion and with the top portion forming vertical and horizontal sealface and gasket.

Ohio, this 14 day of De- Signed at Toledo, cember1929.

' LESLIE R. N. CARVALHO. 

